![]() The Bias control also adds dynamics and allows you to custom match your Tube Driver for any particular pickup/amp combination. Just go up or down a few clicks and he nails what he wants. Eric Johnson used to spend a lot of time looking for perfect tubes to use in his standard Tube Drivers, but now he can just set the bias easily with the stock tube. The Bias control is very helpful as it adjusts the amount of current applied to the cathode of the tube. David Gilmour, Joe Satriani, Billy Gibbons and many other pros now use the Bias mod. ![]() Now he uses a Bias mod Tube Driver on stage. This saved him from sorting through literally hundreds of tubes to find the exact one he wanted. My solution was to install a 5th control that controls the tube cathode current and enables him to ‘dial in’ the tube characteristics he wanted. Years ago, Eric Johnson requested that I install an extra pot in some of his Tube Drivers to help him match the tube response to his super critical hands and ears.
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